anonymous
  • anonymous
a 4.0 pendulum's bob starts swinging from a height of 2.5m as per figure. Assume the friction and air resistance are negligible.
Physics
katieb
  • katieb
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anonymous
  • anonymous
What is the highest point it will reach at the end of the first swing?
anonymous
  • anonymous
at what point is its PE equal to its to KE?
JamesJ
  • JamesJ
Where's the figure?

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JamesJ
  • JamesJ
In this system, btw, energy is conserved. Hence the bob at the end of the pendulum will stop at the same height, on both sides. If it didn't, and it stopped higher, energy was added; if it stopped lower, energy was lost.
Mani_Jha
  • Mani_Jha
Let the height at which K.E And PE are equal be x. P.E=mgx. Total energy= mgh h=4(Conservation of energy) Therefore, mgx=mgh/2 x=h/2
Mani_Jha
  • Mani_Jha
sorry h=2.5 not 4
JamesJ
  • JamesJ
No, that's not right. It's not that we must necessarily have 1/2 of the PE at the top of its swing.

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